<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar class="page-nav-bar" left-arrow title="黑马头条" @click-left="$router.back()"> </van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div class="loading-wrap" v-if="loading">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div class="article-detail" v-else-if="article.title">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ article.title }}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image class="avatar" slot="icon" round fit="cover" :src="article.aut_photo" />
          <div slot="title" class="user-name">{{ article.aut_name }}</div>
          <div slot="label" class="publish-date">{{ article.pubdate | relativeTime }}</div>

          <!-- <van-button v-if="article.is_followed" class="follow-btn" round size="small" @click="followUser" :loading="btnLoading">已关注</van-button>

          <van-button v-else class="follow-btn" type="info" color="#3296fa" round size="small" icon="plus" @click="followUser" :loading="btnLoading">关注</van-button> -->
          <Follow-user class="follow-btn" :isFollow="article.is_followed" :articleId="article.aut_id" @updata-followuser="article.is_followed = $event"></Follow-user>
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div class="article-content markdown-body" v-html="article.content" ref="article-img"></div>
        <!-- 文章评论列表 -->
        <CommontList :scurce="article.art_id" :list="commentList" @onload-success="comments = $event.total_count" @reply-click="onReplyClick"></CommontList>
        <van-divider>正文结束</van-divider>
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div class="error-wrap" v-else-if="errStatus === 404">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div class="error-wrap" v-else>
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn" @click="loadArticle">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>

    <!-- 评论区域 -->
    <van-popup v-model="popupShow" position="bottom">
      <!-- 发布组件 -->
      <CommentPost :target="article.art_id" @post-success="postSuccess"></CommentPost>
    </van-popup>
    <!-- 评论区域 -->

    <!-- 底部区域 -->
    <div class="article-bottom">
      <van-button class="comment-btn" type="default" round size="small" @click="popupShow = true">写评论</van-button>
      <van-icon name="comment-o" :badge="comments" color="#777" />
      <!-- 收藏组件 -->
      <CollectUser v-model="article.is_collected" :articleId="article.art_id"></CollectUser>
      <!-- 点赞组件 -->
      <LikeArticle v-model="article.attitude" :articleId="article.art_id"></LikeArticle>
      <van-icon name="share" color="#777777"></van-icon>
    </div>
    <!-- /底部区域 -->

    <!-- 评论区域 -->
    <van-popup v-model="replyShow" position="bottom" style="height:100%"> <CommentReply v-if="replyShow" :replyComment="replyComment" @close="replyShow = false"></CommentReply> </van-popup>
  </div>
</template>

<script>
import { getArticlelAPI } from '@/api/ArticleList.js'
import { ImagePreview } from 'vant'
import FollowUser from '@/components/follow-user'
import CollectUser from '@/components/collect-user/'
import LikeArticle from '@/components/like-article/'
import CommontList from './components/comment-list'
import CommentPost from './components/comment-post'
import CommentReply from './components/comment-reply'

// ImagePreview({
//   images: ['https://img01.yzcdn.cn/vant/apple-1.jpg', 'https://img01.yzcdn.cn/vant/apple-2.jpg'],
//   startPosition: 1
// })
export default {
  name: 'ArticleIndex',
  components: {
    FollowUser,
    CollectUser,
    LikeArticle,
    CommontList,
    CommentPost,
    CommentReply
  },
  // 给所有的后代提供数据
  provide: function() {
    return {
      articleId: this.articleId
    }
  },
  props: {
    articleId: {
      type: [Number, String, Array],
      required: true
    }
  },
  data() {
    return {
      article: {}, //存储文章数据
      loading: true, //加载中loading的状态
      errStatus: 0,
      btnLoading: false,
      comments: 0, //文章评论数据
      popupShow: false, //控制弹出层显示与隐藏
      commentList: [], //子组件comment-list传上来的值
      replyShow: false, //控制回复层的显示与隐藏
      replyComment: {} //回复的数据
    }
  },
  computed: {},
  watch: {},
  created() {
    this.loadArticle()
  },
  mounted() {},
  methods: {
    async loadArticle() {
      this.loading = true
      try {
        const { data } = await getArticlelAPI(this.articleId)
        // 故意制造随机错误，方便调试
        // if (Math.random() > 0.5) {
        //   JSON.parse('asfdasf')
        // }

        this.article = data.data
        // console.log(this.article)

        // console.log(this.$refs['article-img'])
        setTimeout(() => {
          // console.log(this.$refs['article-img'])
          this.articleImg()
        }, 0)
      } catch (err) {
        if (err.response && err.response.errStatus === 404) {
          this.errStatus = 404
        }
        console.log('获取数据请求失败', err)
      }
      // 无论成功或者失败都要关闭loading
      this.loading = false
    },
    articleImg() {
      const articleimgs = this.$refs['article-img']
      const imgs = articleimgs.querySelectorAll('img')
      // console.log(imgs)
      const images = []
      imgs.forEach((img, index) => {
        images.push(img.src)
        img.onclick = () => {
          ImagePreview({
            // 预览图片的地址数组
            images,
            // 起始位置从0开始
            startPosition: index
          })
        }
      })
    },
    postSuccess(data) {
      //关闭弹出层
      this.popupShow = false
      //将发布内容显示到列表顶部
      this.commentList.unshift(data.new_obj)
    },
    onReplyClick(comment) {
      // console.log(comment)
      this.replyComment = comment
      this.replyShow = true
    }
  }
}
</script>

<style scoped lang="less">
@import './github-markdown.css';
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
